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2019-06-04

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cc-by (c) Massana Cid, Helena et al., 2019
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/143299

Tunable self-healing of magnetically propelling colloidal carpets

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https://doi.org/10.1038/s41467-019-10255-4

Abstract

The process of crystallization is difficult to observe for transported, out-of-equilibrium sys-tems, as the continuous energy injection increases activity and competes with ordering. Inemergingfields such as microfluidics and active matter, the formation of long-range order isoften frustrated by the presence of hydrodynamics. Here we show that a population ofcolloidal rollers assembled by magneticfields into large-scale propelling carpets can formperfect crystalline materials upon suitable balance between magnetism and hydrodynamics.We demonstrate afield-tunable annealing protocol based on a controlled colloidalflow abovethe carpet that enables complete crystallization after a few seconds of propulsion. Thestructural transition from a disordered to a crystalline carpet phase is captured via spatial andtemporal correlation functions. Ourfindings unveil a novel pathway to magnetically annealclusters of propelling particles, bridging driven systems with crystallization and freezing inmaterial science.

Subject

Col·loides, Propietats magnètiques, Cristal·lització, Hidrodinàmica

Subject (English)

Colloids, Magnetic properties, Crystallization, Hydrodynamics

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Articles publicats en revistes (Física de la Matèria Condensada)

Citation

MASSANA-CID, Helena, et al. Tunable self-healing of magnetically propelling colloidal carpets. Nature Communications. 2019. Vol. 10, num. 1, pags. 2444. ISSN 2041-1723. [consulted: 17 of August of 2026]. Available at: https://hdl.handle.net/2445/143299

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